User Instructions - Logix® 520MD+ Series Digital Positioner
FCD LGENIM0105-00
© Flowserve Corporation
18
Field Trial Version – Printed October 28, 2011
Figure 10: Conduit and Grounding
7.6
Electromagnetic Compatibility
The Logix 520MD+ digital positioner has been designed to
operate correctly in electromagnetic (EM) fields found in
typical industrial environments. Care should be taken to
prevent the positioner from being used in environments with
excessively high EM field strengths (greater than 10 V/m).
Portable EM devices such as hand-held two-way radios
should not be used within 30 cm of the device.
Ensure proper wiring and shielding techniques of the control
lines, and route control lines away from electromagnetic
sources that may cause unwanted electrical noise. An
electromagnetic line filter can be used to further eliminate
noise (FLOWSERVE Part Number 10156843).
In the event of a severe electrostatic discharge near the
positioner, the device should be inspected to ensure correct
operability. It may be necessary to recalibrate the Logix
520MD+ positioner to restore operation.
7.7
Intrinsically Safe Barriers
When selecting an intrinsically safe barrier, make sure the
barrier is HART compatible. Although the barrier will pass the
loop current and allow normal positioner control, if not
compatible, it may prevent HART communication.
7.8
Multi-Function Card (AO, DO, DI)
The Multi-Function Card can act as an Analog Output (AO), a
Discrete Output (DO), or a Discrete Input (DI). Connections
to the Multi-Function Card are made directly to the card
terminals. For detailed information about voltage and current
limits, see Table 12: Auxiliary Card Status below.
For AO and DO functions wire the MFC in series with a 10 to
40 VDC power supply, including a method to determine the
current. When configured as an AO, the current will follow
the valve position. When configured as a DO, current will
remain high until the user-defined conditions are met, then
drop low when tripped.
Figure 11: MFC Analog Output or Discrete Output Circuit
For the DI function, wire the MFC in series with a 0 to 40
VDC power supply. Keep the voltage low under normal
circumstances. Raise the voltage to indicate a tripped input
state.
Figure 12: MFC Discrete Input Circuit
Table 12: Auxiliary Card Status
Card
Condition
Status Indication
MFC (AO)
Monitoring Position
(typical 4-20mA )
< 1.0 mA = Lost
Positioner Power
Output (mA)
MFC (DO)
High
(output > 2.2 mA,
typical 6 mA)
1 - Nominal
Low
(1.0 mA > output >
100 uA, typical 1.1
mA)
0 - Tripped
MFC (DI)
Low
(input < 3.0 VDC)
1 - Nominal
High
(input > 10.0 VDC)
0 - Tripped
Safety DO
Circuit Closed
(500 mA max)
1 - Nominal
Circuit Opened
(60 VDC max)
0 - Tripped
Position Feedback
or
Discrete Output
Current Loop
(Logix Output)
10 VDC
to
40 VDC
Voltage
Source
MFC
0 VDC
to
40 VDC
Voltage
Source
MFC
Discrete Input
Voltage Loop
(Logix Input)
Grounding
Terminals
Electrical
Conduit
Connections
Conduit
Thread Size
Содержание Logix 520MD+
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